Due to a planned power outage on Friday, 1/14, between 8am-1pm PST, some services may be impacted.
Une explication du phonopore, se rapportant plus spécialement au télégraphe phonopore simplex. An explanation of the phonopore, and more especially the simplex phonopore telegraph. With reports on the phonopore system and instruments by Latimer Clark [and others]
Une explication du phonopore, se rapportant plus spécialement au télégraphe phonopore simplex. An explanation of the phonopore, and more especially the simplex phonopore telegraph. With reports on the phonopore system and instruments by Latimer Clark [and others]